package com.fanx.media.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.fanx.base.execption.FanXPlusException;
import com.fanx.base.model.PageParams;
import com.fanx.base.model.PageResult;
import com.fanx.base.model.RestResponse;
import com.fanx.media.mapper.MediaFilesMapper;
import com.fanx.media.mapper.MediaProcessMapper;
import com.fanx.media.model.dto.QueryMediaParamsDto;
import com.fanx.media.model.dto.UploadFileParamsDto;
import com.fanx.media.model.dto.UploadFileResultDto;
import com.fanx.media.model.po.MediaFiles;
import com.fanx.media.model.po.MediaProcess;
import com.fanx.media.service.MediaFileService;
import com.j256.simplemagic.ContentInfo;
import com.j256.simplemagic.ContentInfoUtil;
import io.minio.*;
import io.minio.errors.*;
import io.minio.messages.DeleteError;
import io.minio.messages.DeleteObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.io.*;;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @author Mr.M
 * @version 1.0
 * @description TODO
 * @date 2022/9/10 8:58
 */
@Slf4j
@Service
public class MediaFileServiceImpl implements MediaFileService {

    @Autowired
    MediaFilesMapper mediaFilesMapper;

    @Autowired
    MinioClient minioClient;

    //存储普通文件
    @Value("${minio.bucket.files}")
    private String bucket_mediaFiles;

    //存储视频
    @Value("${minio.bucket.videofiles}")
    private String bucket_video;

    //注入对象，使事务的代理对象是同一个
    @Autowired
    MediaFileServiceImpl mediaFileProxy;

    @Resource
    MediaProcessMapper mediaProcessMapper;

    @Override
    public PageResult<MediaFiles> queryMediaFiels(Long companyId, PageParams pageParams, QueryMediaParamsDto queryMediaParamsDto) {

        //构建查询条件对象
        LambdaQueryWrapper<MediaFiles> queryWrapper = new LambdaQueryWrapper<>();

        //分页对象
        Page<MediaFiles> page = new Page<>(pageParams.getPageNo(), pageParams.getPageSize());
        // 查询数据内容获得结果
        Page<MediaFiles> pageResult = mediaFilesMapper.selectPage(page, queryWrapper);
        // 获取数据列表
        List<MediaFiles> list = pageResult.getRecords();
        // 获取数据总数
        long total = pageResult.getTotal();
        // 构建结果集
        PageResult<MediaFiles> mediaListResult = new PageResult<>(list, total, pageParams.getPageNo(), pageParams.getPageSize());
        return mediaListResult;

    }

    //根据扩展名获取mimeType
    private String getMineType(String extension) {
        //防止空指针异常
        if (extension == null) {
            extension = "";
        }
        //根据扩展名取出mimetype
        ContentInfo extensionMatch = ContentInfoUtil.findExtensionMatch(extension);
        String mimeType = MediaType.APPLICATION_OCTET_STREAM_VALUE;//通用mimeType，字节流
        if (extensionMatch != null) {
            mimeType = extensionMatch.getMimeType();
        }
        return mimeType;
    }

    //根据文件默认存储目录路径年月日
    private String getDefaultFolderPath(){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        //拿到当前时间，转为年月日，将-替换/，然后加/ 结果: //2023/02/17/
        String folder = sdf.format(new Date()).replace("-", "/") + "/";
        return folder;
    }

    //获取文件的MD5
    private String getFileMd5(File file){
        try(FileInputStream fileInputStream = new FileInputStream(file)){
            String fileMd5 = DigestUtils.md5Hex(fileInputStream);
            return fileMd5;
        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }

    /**
     * //将文件上传到minio
     * @param bucket 桶
     * @param localFilePath 文件路径
     * @param objectName 对象名
     * @param mimeType 文件类型
     * @return 是否上传成功
     */
    public boolean addMediaFileToMedia(String bucket, String localFilePath, String objectName, String mimeType) {
        try {
            UploadObjectArgs uploadObjectArgs = UploadObjectArgs.builder().bucket(bucket)//桶
                    .filename(localFilePath)//指定本地文件路径
                    .object(objectName)//对象名
                    .contentType(mimeType)//媒体文件类型
                    .build();
            //上传文件
            minioClient.uploadObject(uploadObjectArgs);
            log.debug("上传文件到minio成功！bucket:{},objectName:{}",bucket,objectName);
            return true;
            //上传文件
            //minioClient.uploadObject(uploadObjectArgs);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("上传文件出错！bucket:{},objectName:{},错误信息:{}",bucket,objectName,e.getMessage());
        }
        return false;
    }

    @Override
    public MediaFiles getFileById(String mediaId) {
        return mediaFilesMapper.selectById(mediaId);
    }

    @Override
    public UploadFileResultDto uploadFile(Long companyId, UploadFileParamsDto uploadFileParamsDto, String localFilePath,String objectName) {
        //文件名
        String filename = uploadFileParamsDto.getFilename();
        //得到扩展名
        String extension = filename.substring(filename.lastIndexOf("."));
        //根据扩展名取出mimetype
        String mimeType = getMineType(extension);
        //子目录
        String defaultFolderPath = getDefaultFolderPath();
        //文件的MD5值
        String fileMd5 = getFileMd5(new File(localFilePath));
        if (objectName.isEmpty()) {
            //文件对象 路径+文件名+扩展名,根据年月日去存储
            objectName = defaultFolderPath + fileMd5 + extension;
        }
        //上传文件到minio，上传问文件的参数信息
        boolean result = addMediaFileToMedia(bucket_mediaFiles, localFilePath, objectName, mimeType);
        if(!result){
            FanXPlusException.cast("上传文件失败");
        }
        //入库文件信息
        MediaFiles mediaFiles = mediaFileProxy.addMediaFilesToDb(companyId, fileMd5, uploadFileParamsDto, bucket_mediaFiles, objectName);
        if (mediaFiles==null){
            FanXPlusException.cast("文件上传后保存信息失败！");
        }
        //准备返回的对象
        UploadFileResultDto uploadFileResultDto = new UploadFileResultDto();
        BeanUtils.copyProperties(mediaFiles,uploadFileResultDto);
        return uploadFileResultDto;
    }

    /**
     *将文件信息添加到文件表
     * @param companyId 机构id
     * @param fileMd5 文件的MD5值
     * @param uploadFileParamsDto 上传文件的信息
     * @param bucket 桶
     * @param objectName 对象名称
     * @return 保存数据库信息
     */
    @Transactional
    public MediaFiles addMediaFilesToDb(Long companyId,String fileMd5,UploadFileParamsDto uploadFileParamsDto,String bucket,String objectName){
        //将文件信息保存到数据库
        MediaFiles mediaFiles = mediaFilesMapper.selectById(fileMd5);
        if (mediaFiles == null){
            mediaFiles = new MediaFiles();
            BeanUtils.copyProperties(uploadFileParamsDto,mediaFiles);
            //文件id
            mediaFiles.setId(fileMd5);
            //机构id
            mediaFiles.setCompanyId(companyId);
            //桶
            mediaFiles.setBucket(bucket);
            //filePath
            mediaFiles.setFilePath(objectName);
            //file_id
            mediaFiles.setFileId(fileMd5);
            //url
            mediaFiles.setUrl("/"+bucket+"/"+objectName);
            //上传时间
            mediaFiles.setCreateDate(LocalDateTime.now());
            //状态
            mediaFiles.setStatus("1");
            //审核状态
            mediaFiles.setAuditStatus("002003");
            //插入数据库
            int insert = mediaFilesMapper.insert(mediaFiles);
            if (insert<=0){
                log.debug("文件保存数据库失败！bucket:{},object:{}",bucket,objectName);
                return null;
            }
            //记录代处理任务
            //通过mimetype判断如果是MP4视频写入代处理任务
            //向MediaProcess插入记录
            addWaitingTask(mediaFiles);



            return mediaFiles;
        }
        return mediaFiles;
    }

    /**
     * 添加待处理任务
     * @param mediaFiles 媒资文件信息
     */
    private void addWaitingTask(MediaFiles mediaFiles){
        //文件名称
        String filename = mediaFiles.getFilename();
        //文件扩展名
        String extension = filename.substring(filename.lastIndexOf("."));
        //获取文件的mimetype
        String mineType = getMineType(extension);
        if (mediaFiles.equals("video/x-msvideo")){
            MediaProcess mediaProcess = new MediaProcess();
            BeanUtils.copyProperties(mediaFiles,mediaProcess);
            //默认状态是未处理
            mediaProcess.setStatus("0");
            mediaProcess.setCreateDate(LocalDateTime.now());
            mediaProcess.setUrl(null);
            mediaProcess.setFailCount(0);

            mediaProcessMapper.insert(mediaProcess);
        }
    }

    @Override
    public RestResponse<Boolean> checkFile(String fileMd5) {
        //先查询数据库
        MediaFiles mediaFiles = mediaFilesMapper.selectById(fileMd5);
        if (mediaFiles != null){
            String bucket = mediaFiles.getBucket();
            String filePath = mediaFiles.getFilePath();
            //如果数据库存在再查询minio
            GetObjectArgs getObjectArgs = GetObjectArgs.builder()
                    .bucket(bucket)
                    .object(filePath)
                    .build();
            //查询远程服务获取到一个流对象
            try {
                FilterInputStream inputStream = minioClient.getObject(getObjectArgs);
                if (inputStream != null){
                    //数据库，minio有数据
                    return RestResponse.success(true);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //文件不存在
        return RestResponse.success(false);
    }

    @Override
    public RestResponse<Boolean> checkChunk(String fileMd5, int chunkIndex) {
        //分块存储路径是：md5的前两个字符为两个子目录，chunk专门存储分块文件
        //根据MD5得到分块文件的路径
        String chunkFileFolderPath = getChunkFileFolderPath(fileMd5);

        //如果数据库存在再查询minio
        GetObjectArgs getObjectArgs = GetObjectArgs.builder()
                .bucket(bucket_video)
                .object(chunkFileFolderPath+chunkIndex)
                .build();
        //查询远程服务获取到一个流对象
        try {
            FilterInputStream inputStream = minioClient.getObject(getObjectArgs);
            if (inputStream != null){
                //数据库，minio有数据
                return RestResponse.success(true);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return RestResponse.success(false);
    }

    @Override
    public RestResponse uploadChunk(String fileMd5, int chunk, String localChunkFilePath) {
        //分开文件的路径
        String chunkFilePath = getChunkFileFolderPath(fileMd5) + chunk;
        //获取mimeType
        String mimeType = getMineType(null);
        //将分块文件上传到minio
        boolean b = addMediaFileToMedia(bucket_video,localChunkFilePath,chunkFilePath,mimeType);
        if (!b){
            return RestResponse.validfail(false,"上传分块文件失败！");
        }
        return RestResponse.success(true);
    }

    @Override //合并分块
    public RestResponse mergechunks(Long companyId, String fileMd5, int chunkTotal, UploadFileParamsDto uploadFileParamsDto) {
        //分块文件所在目录
        String chunkFileFolderPath = getChunkFileFolderPath(fileMd5);
        //找到所有的分块文件调用minio的sdk进行文件合并
        List<ComposeSource> sources = Stream.iterate(0, i -> ++i).limit(chunkTotal)
                .map(i -> ComposeSource
                .builder()
                .bucket(bucket_video)
                .object(chunkFileFolderPath + i)
                .build()).collect(Collectors.toList());

        //源文件名称
        String filename = uploadFileParamsDto.getFilename();
        //扩展名
        String extension = filename.substring(filename.lastIndexOf("."));
        //合并后文件的objectName
        String objectName = getFilePathByMd5(fileMd5, extension);

        //指定合并后的objectName等信息
        ComposeObjectArgs composeObjectArgs = ComposeObjectArgs.builder()
                .bucket(bucket_video)
                .object(objectName)
                .sources(sources)
                .build();
        //=================合并文件========================
        try {
            minioClient.composeObject(composeObjectArgs);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("合并文件出错,bucket:{},objectName:{},错误信息:{}",bucket_video,objectName,e.getMessage());
            return RestResponse.validfail(false,"合并文件异常");
        }
        //=================校验合并后的和源文件是否一致，视频才上传成功======================

        //====================先下载合并后的文件=================
        File file = downloadFileFromMinIO(bucket_video, objectName);
        try(FileInputStream fileInputStream = new FileInputStream(file)) {
            //计算合并后文件md5
            final String mergeFile_md5 = DigestUtils.md5Hex(fileInputStream);
            if (!fileMd5.equals(mergeFile_md5)){
                log.error("校验何明文件MD5值不一致，原始文件:{},合并文件:{}",fileMd5,mergeFile_md5);
                return RestResponse.validfail(false,"文件校验失败！");
            }
            //文件大小
            uploadFileParamsDto.setFileSize(file.length());
        } catch (Exception e){
          return RestResponse.success(false,"文件校验失败！");
        }
        //=========================将文件信息入库=======================
        MediaFiles mediaFiles =  mediaFileProxy.addMediaFilesToDb(companyId, fileMd5, uploadFileParamsDto, bucket_video, objectName);
        if (mediaFiles == null){
            return RestResponse.validfail(false,"文件入库失败！");
        }
        //=========================清理分块文件=======================
        clearChunkFiles(chunkFileFolderPath,chunkTotal);
        return RestResponse.success(true);
    }

    /**
     * 清除分块文件
     * @param chunkFileFolderPath 分块文件路径
     * @param chunkTotal 分块文件总数
     */
    private void clearChunkFiles(String chunkFileFolderPath,int chunkTotal){
        Iterable<DeleteObject> objects = Stream.iterate(0, i -> ++i).limit(chunkTotal)
                .map(i -> new DeleteObject(chunkFileFolderPath + i))
                .collect(Collectors.toList());

        RemoveObjectsArgs removeObjectsArgs = RemoveObjectsArgs.
                builder().bucket(bucket_video).objects(objects).build();
        Iterable<Result<DeleteError>> results = minioClient.removeObjects(removeObjectsArgs);
        results.forEach(f ->{
            try {
                DeleteError deleteError = f.get();
                log.debug("删除成功！");
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
    }

    /**
     * 从minio下载文件
     * @param bucket 桶
     * @param objectName 对象名称
     * @return 下载后的文件
     */
    public File downloadFileFromMinIO(String bucket,String objectName){
        //临时文件
        File minioFile = null;
        FileOutputStream outputStream = null;
        try{
            InputStream stream = minioClient.getObject(GetObjectArgs.builder()
                    .bucket(bucket)
                    .object(objectName)
                    .build());
            //创建临时文件
            minioFile=File.createTempFile("minio", ".merge");
            outputStream = new FileOutputStream(minioFile);
            IOUtils.copy(stream,outputStream);
            return minioFile;
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if(outputStream!=null){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

    /**
     * 得到合并后的文件的地址
     * @param fileMd5 文件id即md5值
     * @param fileExt 文件扩展名
     * @return 目录
     */
    private String getFilePathByMd5(String fileMd5,String fileExt){
        return fileMd5.charAt(0) + "/" + fileMd5.charAt(1) + "/" + fileMd5 + "/" + fileMd5 + fileExt;
    }

    //得到分块文件的路径
    private String getChunkFileFolderPath(String fileMd5){
        return fileMd5.charAt(0) + "/" + fileMd5.charAt(1) + "/" + fileMd5 + "/chunk" + "/";
    }
}
